So I picked up the liner last night. Easy fit as Graeme said. I did mine slightly differently in that I didn't worry about a couple of the holes that had to be drilled.
The radiator in question:

The cat helping:

Rear section of the liner:

Vent section:
What I did here was only drill the one hole on the inside corner. I did this slightly higher than the previous liner as well. This allowed me to push up the under tray to above the lip that Graeme mentioned. This means I didn't have to cut it out. I don't know if this is possible with a stock tray is possible as mine has been modified for my skid plate. The other two holes for the centre and outer part of the under tray don't seem to be really necessary so I didn't worry about them.

Installed:
The radiator in question:

The cat helping:

Rear section of the liner:

Vent section:
What I did here was only drill the one hole on the inside corner. I did this slightly higher than the previous liner as well. This allowed me to push up the under tray to above the lip that Graeme mentioned. This means I didn't have to cut it out. I don't know if this is possible with a stock tray is possible as mine has been modified for my skid plate. The other two holes for the centre and outer part of the under tray don't seem to be really necessary so I didn't worry about them.

Installed:

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